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P0723 GMC Code - Transmission Output Speed Sensor Circuit Intermittent

Quick Answer

The P0723 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the transmission output speed sensor circuit being intermittent. Common causes include Faulty transmission output speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris affecting the sensor's performance. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0723 GMC indicates Transmission Output Speed Sensor Circuit Intermittent.
Common causes
Common causes include Faulty transmission output speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris affecting the sensor's performance.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0723 GMC Description

The P0723 diagnostic trouble code (DTC) for GMC vehicles indicates a problem with the transmission output speed sensor circuit being intermittent. This sensor is crucial for monitoring the speed of the output shaft on the transmission. The information it provides is used by the vehicle's engine control module (ECM) to determine the correct shift points for the transmission, ensuring smooth operation and optimal performance.

OBDII Code P0723 GMC - Transmission Output Speed Sensor Circuit Intermittent
P0723 GMC Code - Transmission Output Speed Sensor Circuit Intermittent

Common Causes of P0723 GMC

  1. Faulty transmission output speed sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or debris affecting the sensor's performance
  4. Issues with the ECM or related control modules
  5. Poor electrical connections or grounds

Symptoms of P0723 GMC

  1. Erratic shifting behavior
  2. Hesitation during acceleration
  3. Transmission slipping
  4. Illumination of the check engine light
  5. Decreased fuel efficiency

How to Fix P0723 GMC

  1. Inspect the transmission output speed sensor for damage or malfunction.
  2. Check the wiring and connectors in the sensor circuit for any signs of damage or corrosion.
  3. Clean or replace any affected components as needed.
  4. Test the sensor and circuit to ensure they are functioning properly.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0723 GMC

The typical repair costs for addressing a P0723 GMC code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of replacing a transmission output speed sensor can range from $100 to $250, including parts and labor. However, additional diagnostic time and any necessary repairs to the wiring or connectors may increase the overall cost. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary widely based on location and the complexity of the repair.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0723 GMC Code

1. What does the OBDII code P0723 mean for a GMC vehicle?

P0723 indicates an intermittent issue with the transmission output speed sensor circuit, which measures the rotational speed of the transmission’s output shaft.

2. What are the common symptoms of code P0723 in a GMC?

Symptoms may include erratic shifting, the transmission stuck in a single gear (limp mode), inaccurate speedometer readings, or the check engine light being illuminated.

3. What causes the P0723 code to appear on a GMC vehicle?

Common causes include a faulty output speed sensor, damaged wiring or connectors in the speed sensor circuit, a malfunctioning transmission control module (TCM), or debris interfering with the sensor.

4. Can I drive my GMC with a P0723 code?

Driving with this code is not recommended as it can result in poor transmission performance, potential damage to the transmission, and unsafe driving conditions.

5. How do I diagnose the P0723 code on my GMC?

Diagnosis involves checking the output speed sensor for damage, inspecting the wiring and connectors for corrosion or wear, and testing the sensor's signal with a multimeter or scan tool.

6. How do I fix the P0723 code on a GMC vehicle?

Repairs typically include replacing the faulty output speed sensor, repairing or replacing damaged wiring or connectors, and in rare cases, reprogramming or replacing the TCM.

7. How much does it cost to repair a P0723 code on a GMC?

Costs vary depending on the repair, ranging from $150-$300 for sensor replacement to higher costs if wiring or the TCM requires replacement.

8. Can a bad transmission output speed sensor trigger the P0723 code?

Yes, a defective speed sensor is one of the most common causes of this code, as it disrupts the signal needed for proper transmission operation.

9. Will clearing the code fix the P0723 issue on a GMC?

Clearing the code may temporarily remove the check engine light, but the underlying issue must be resolved to prevent the code from returning.

10. What tools are needed to troubleshoot the P0723 code on a GMC?

You’ll need an OBDII scanner, a multimeter for electrical testing, and potentially a repair manual or wiring diagram specific to your GMC model.

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